Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Reexamination Certificate
2000-01-10
2001-04-10
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
C239S377000, C239S379000, C285S190000
Reexamination Certificate
active
06213410
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to gravity-fed spray guns and more particularly to an apparatus for providing enhanced spray capabilities for such gravity-fed spray guns.
2. Description of the Related Art
Spray guns are commonly used to apply paint, primer or any other liquid substance to a surface. The most common handicap a painter encounters, regardless of whether he is using a gravity or suction spray gun is the inability to go low enough to paint upward. For example, in the auto body industry, the rocker panel (below the door line) is seldom painted on the lower surfaces. The reason for this deficiency is that the car is too low to the ground and the spray gun assembly is too long to provide for proper access. A gravity-fed spray gun, excluding regulator and hose connection is generally 11 to 13 inches long. A suction spray gun is generally 13 inches long excluding regulator and hose connection. The spray gun cannot be tilted sideways without the possibility of spilling paint from the cup or having the smooth flow of paint to the gun being interrupted.
Similar problems exist in the paint industry, generally. For example, in spraying overhead, the painter cannot always conveniently tilt the spray at the proper angle for proper application of the paint, or other surface treatments.
As one solution to these problems, the present applicant has invented an improved spray gun, disclosed and claimed in U.S. Pat. No. 5,803,360 entitled “Apparatus for Providing Enhanced Spray Gun Capabilities for a Gravity-Fed Spray Gun.” That invention utilizes a swivel joint assembly that provides rotation of the fluid cup along a fluid cup offset axis, which is perpendicular to the fluid cup axis. After rotation of the fluid cup relative to the spray gun body the nozzle has to be rotated to obtain the previous spray pattern.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore a principal object of the present invention to provide efficient use of a gravity-fed spray gun for surfaces not easily accessible, such as low surfaces and overhead surfaces.
It is another object to obviate the requirement of rotating the nozzle assembly when the spray gun body is rotated relative to the fluid cup and still maintain the desired spray pattern orientation while maintaining the fluid cup in a substantially vertical position.
These and other objects are achieved by the present invention which is a gravity-fed spray gun assembly of the type having a nozzle assembly, a spray gun body assembly and a nozzle nut for adjusting the relative angular orientation of the nozzle assembly relative to the spray gun body assembly. The gravity-fed spray gun assembly includes a spray gun body assembly, a fluid delivery assembly and a friction-induced locking element. The fluid delivery assembly includes a rotatable element, a nozzle assembly and a fluid cup. The rotatable element is rotatively connected to the spray gun body assembly. The nozzle assembly is securely attached to the rotatable element. The nozzle assembly is maintained unable to rotate relative to the rotatable element unless a nozzle nut is adjusted. The nozzle assembly has a nozzle opening defining a nozzle axis. The rotatable element is rotatable about the nozzle axis. The fluid cup is securely attached to the rotatable element. The friction-induced locking element utilizes a predetermined preload that cooperatively engages the spray gun body assembly and the fluid delivery assembly to securely maintain the spray gun body assembly relative to the fluid delivery assembly at the desired relative angular orientation. The present invention obviates any requirement for loosening the nozzle nut to rotate the nozzle assembly relative to the spray gun body assembly when the spray gun body assembly is rotated relative to the fluid cup.
Other objects, advantages, and novel features will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
REFERENCES:
patent: 5366158 (1994-11-01), Robisch et al.
patent: 5810258 (1998-09-01), Wu
patent: 5918815 (1999-07-01), Wu
patent: 6012651 (2000-01-01), Sptznagel
patent: 6092740 (2000-07-01), Liu
Nguyen Dinh Q.
Scherbel David A.
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